Mojo: Replace RemotePtr with InterfacePtr and InterfaceImpl

mojo/public/cpp/bindings/interface_impl.h

+// Copyright 2014 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef MOJO_PUBLIC_CPP_BINDINGS_INTERFACE_IMPL_H_
+#define MOJO_PUBLIC_CPP_BINDINGS_INTERFACE_IMPL_H_
+
+#include "mojo/public/cpp/bindings/lib/interface_impl_internal.h"
+#include "mojo/public/cpp/system/macros.h"
+
+namespace mojo {
+
+// InterfaceImpl<..> is designed to be the base class of an interface
+// implementation. It may be bound to a pipe or a proxy, see BindToPipe and
+// BindToProxy.
+//
+// NOTE: A base class of WithErrorHandler<Interface> is used to avoid multiple
+// inheritance. This base class inserts the signature of ErrorHandler into the
+// inheritance chain.
+template <typename Interface>
+class InterfaceImpl : public WithErrorHandler<Interface> {
+ public:
+  InterfaceImpl() : internal_state_(this) {}
+  virtual ~InterfaceImpl() {}
+
+  // Subclasses must handle connection errors.
+  virtual void OnConnectionError() = 0;
+
+  // DO NOT USE. Exposed only for internal use and for testing.

[DaveMoore, 2014/05/08 18:27:30]

Perhaps this could be exposed by creating a nested class and friending that
class to the allowed clients.

+  internal::InterfaceImplState<Interface>* internal_state() {
+    return &internal_state_;
+  }
+
+ private:
+  internal::InterfaceImplState<Interface> internal_state_;
+  MOJO_DISALLOW_COPY_AND_ASSIGN(InterfaceImpl);
+};
+
+// Takes an instance of an InterfaceImpl<..> subclass and binds it to the given
+// MessagePipe. The instance is returned for convenience in member initializer
+// lists, etc. If the pipe is closed, the instance's OnConnectionError method
+// will be called.
+//
+// The instance is also bound to the current thread. Its methods will only be
+// called on the current thread, and if the current thread exits, then it will
+// also be deleted, and along with it, its end point of the pipe will be closed.
+//
+// Before returning, the instance will receive a SetClient call, providing it
+// with a proxy to the client on the other end of the pipe.
+template <typename Impl>
+Impl* BindToPipe(Impl* instance,
+                 ScopedMessagePipeHandle handle,
+                 MojoAsyncWaiter* waiter = GetDefaultAsyncWaiter()) {
+  instance->internal_state()->Bind(handle.Pass(), waiter);
+  return instance;
+}
+
+// Takes an instance of an InterfaceImpl<..> subclass and binds it to the given
+// InterfacePtr<..>. The instance is returned for convenience in member
+// initializer lists, etc. If the pipe is closed, the instance's
+// OnConnectionError method will be called.
+//
+// The instance is also bound to the current thread. Its methods will only be
+// called on the current thread, and if the current thread exits, then it will
+// also be deleted, and along with it, its end point of the pipe will be closed.
+//
+// Before returning, the instance will receive a SetClient call, providing it
+// with a proxy to the client on the other end of the pipe.
+template <typename Impl, typename Interface>
+Impl* BindToProxy(Impl* instance,
+                  InterfacePtr<Interface>* ptr,
+                  MojoAsyncWaiter* waiter = GetDefaultAsyncWaiter()) {
+  instance->internal_state()->BindProxy(ptr, waiter);
+  return instance;
+}
+
+}  // namespace mojo
+
+#endif  // MOJO_PUBLIC_CPP_BINDINGS_INTERFACE_IMPL_H_